Member hfst.read_att_transducer (f, epsilonstr=hfst.EPSILON): Empty transducers are in theory represented as empty strings in AT&T format. However, this sometimes results in them getting interpreted as end-of-file. To avoid this, use an empty line instead, i.e. a single newline character.
Member HfstTransducer.minimize (self): OpenFst's minimization algorithm seems to add epsilon transitions to weighted transducers?